function randomNumber(limit){
  return (Math.floor(Math.random()*limit) + 1) ;
}

//Convert Integer to Strings
function stringToInteger (inputString)
{
  return parseInt(inputString);
}

function buildImage(alt, src, imageNumber) {
  imageName = src;
  if (stringToInteger(imageNumber) > 1) {
   // randomize Image Name
   dotPlace = src.lastIndexOf(".");
   uscorePlace = src.lastIndexOf("_");
   imageName = src.substring(0,uscorePlace+1) + imageNumber + src.substr(dotPlace,src.length - dotPlace);
  }
  document.write("<img border='0' alt='"+alt+"' src='"+imageName+ "' />");
}